Malicious PDF — malware analysis report

Static analysis result for SHA-256 65e2cb85199b8218…

MALICIOUS

PDF

106.4 KB Created: 2021-09-07 15:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 394c030c0ef08843ca495fca8968f616 SHA-1: 244a21fac74f9e7cede915635512bdfa6d5c7f6d SHA-256: 65e2cb85199b8218573b0258d78f82df7b566c9899960c415a89e6c085f2bd8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content or phishing pages, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cructi.ru/uplcv?utm_term=mahavatar+babaji+biography+pdf PDF link annotation
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b920eb144a4---59503441641.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/56083425521.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/lumaji.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/a5a9dbedc1df735f7ed021bfa849a9ef/temaguzetilaj.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/c83ea4e515416b3bf982e77a81dc1095/gikevemabudon.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/napakas.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021063015211373499.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608835e938494---93379832902.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/dajazipasapari.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles//file/5339685796.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16126ba1bc6eff---boloremebomoje.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612456d50b168---42428085140.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/49264679ffaec6d7243bf0e649f6c89b/27627116294.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/vezadozujutumawosu.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fenogegaponesufukajorik.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096e1762dcef---fajajupufakatu.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98f0b98b4---66825668444.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/24417409787.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/44914302633.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/hjf1se55hn9e0i6n2nv6ko74mm/lolavoduxoxa.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9009377b07---65897351635.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/a16mqs2uqdaumjsu46j5vpj460/39433493444.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/1ea21e92709e7da8916818a199c70fad/64717034059.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16118495f20cdd---14338865777.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/89450942687.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F98 10768 bytes
SHA-256: ef35aaff4df421368cb11da3953b7a0c4a65a480f238b931d67585cf8f791398
font_01_sfnt_off00013807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13807 16364 bytes
SHA-256: 8cb00dc771bbd52c39356e90d3af27bf4ba22461ce4af03b55cf45581fc5ab66
font_02_sfnt_off00014e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E6A 20260 bytes
SHA-256: fc9019e998e5b9be6553fe8e65b969b3fb823ef6b0dd59da21dbad31e2c023de
font_03_sfnt_off00018318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18318 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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